Java 正则表达式解析 Html

superadmin · 发表于 2009-4-24 13:00:48

去年在 Uptech 的时候写过一个开源的 XMPP Robat ，当时有一个搜索天气信息的功能，我用了 HtmlParser 来解析网页，说实话 HtmlParser 的确不错，只是我没什么时间琢磨他，使用还不习惯，所以现在换成正责表达式来解析网页，其实是想尝试尝试一下，现在解析天气预报信息的方式已从 HtmlParser 转移到了 Java 正则表达式，这是刚实现的一段代码，贴出来共享 ...

/**
* Copyright (C) 2006 the original author or authors.
*
* This software is published under the terms of the GNU Public License (GPL),
* a copy of which is included in this distribution.
*/

package com.boar.modules;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.boar.container.BasicModule;

/**
* @author <a href="Ben">zhuaming@gmail.com">Ben </a>
*/
public class WeatherModule extends BasicModule{

private static ScheduledExecutorService executor = null;
private static Map cache = new ConcurrentHashMap();

private static final String urlLink =
  "http://weather.tq121.com.cn/mapanel/index.php?city=";

private static final String citys[] = {
  "北京", "哈尔滨", "长春", "沈阳", "大连",
  "天津", "呼和浩特","乌鲁木齐", "西宁", "银川",
  "兰州", "西安", "拉萨", "成都","重庆", "贵阳",
  "昆明", "太原", "石家庄", "济南", "青岛", "郑州",
  "合肥", "南京", "徐州", "连云港", "上海", "武汉",
  "长沙", "南昌", "杭州", "福州", "厦门", "台北",
  "南宁", "桂林", "海口", "三亚", "广州", "香港", "澳门"
};

public WeatherModule() {
  super(" Weather Module");
}

public void start(){
   executor = new ScheduledThreadPoolExecutor(1);
   executor.scheduleWithFixedDelay(new WeatherMonitor(), 0, 60 * 60, TimeUnit.SECONDS);
}

public void stop() {
   if (executor != null) {
executor.shutdown();
  }
   if (cache != null){
   cache.clear();
   }
}

public String search(String city){

  if (cache.containsKey(city.trim())){
return cache.get(city.trim()).toString();
  }
  return " Not support .";
}

private class WeatherMonitor implements Runnable {

  public void run()  {
cache.clear();
parse();
  }

  private String getWeather(String pattern, String match){
      Pattern sp = Pattern.compile(pattern);
   Matcher matcher = sp.matcher(match);
      while(matcher.find()){
      return matcher.group(1);
      }
      return "";
  }

  private void parse() {
for(int i=0;i<= citys.length-1;i++){
StringBuffer pageBuffer = new StringBuffer();
try {
   URL url = new URL(urlLink + citys);
   URLConnection ret = url.openConnection();
   String input ;

   BufferedReader br = new BufferedReader(new InputStreamReader(ret.getInputStream()));
   while((input = br.readLine()) != null) {
   pageBuffer.append(input);
   }
}catch(Exception e){
   System.out.println(e.getMessage());
}

StringBuffer weatherBuffer = new StringBuffer();

      weatherBuffer.append(getWeather("<td width=\"163\" align=\"center\" valign=\"top\"><span class=\"big-cn\">(.*?)</span>",pageBuffer.toString()));
      weatherBuffer.append(getWeather("<td width=\"160\" align=\"center\" valign=\"top\" class=\"weather\">(.*?)</td>",pageBuffer.toString()));
      weatherBuffer.append(getWeather("<td width=\"153\" valign=\"top\"><span class=\"big-cn\">(.*?)</span>",pageBuffer.toString()));
      weatherBuffer.append(getWeather("class=\"weatheren\">(.*?)</td>",pageBuffer.toString()));

cache.put(citys, weatherBuffer.toString());
}
  }
}
}

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Java 正则表达式解析 Html

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